Where everything is bipartisan until it is not.
Someone officially proposed for a position, election, award, or honor by another person or group — they're not in yet, but they're on the shortlist. In politics, it's the person chosen to represent a party in an election. The term also applies to proxy ownership situations where assets are registered in someone's name on behalf of the actual owner.
A dramatic parliamentary maneuver where the majority party unilaterally changes Senate rules, typically to eliminate the filibuster for certain votes. Called 'nuclear' because it's theoretically devastating but both parties keep doing it anyway.